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Titolo:
Behavior of sulfentrazone in ionic exchange resins, electrophoresis gels, and cation-saturated soils
Autore:
Grey, TL; Walker, RH; Wehtje, GR; Adams, J; Dayan, FE; Weete, JD; Hancock, HG; Kwon, O;
Indirizzi:
Univ Georgia, Dept Crop & Soil Sci, Coll Agr & Environm Sci, Georgia Expt Stn, Griffin, GA 30223 USA Univ Georgia Griffin GA USA 30223 Georgia Expt Stn, Griffin, GA 30223 USA Auburn Univ, Dept Agron & Soils, Alabama Agr Expt Stn, Auburn, AL 36849 USA Auburn Univ Auburn AL USA 36849 labama Agr Expt Stn, Auburn, AL 36849 USA Univ Mississippi, USDA ARS, Natl Prod Utilizat Res Unit, Stoneville, MS 38667 USA Univ Mississippi Stoneville MS USA 38667 s Unit, Stoneville, MS 38667 USA W Virginia Univ, Morgantown, WV 26506 USA W Virginia Univ Morgantown WV USA 26506 ia Univ, Morgantown, WV 26506 USA FMC Corp, Hamilton, GA 31811 USA FMC Corp Hamilton GA USA 31811FMC Corp, Hamilton, GA 31811 USA Auburn Univ, Dept Chem, Auburn, AL 36849 USA Auburn Univ Auburn AL USA 36849 urn Univ, Dept Chem, Auburn, AL 36849 USA
Titolo Testata:
WEED SCIENCE
fascicolo: 2, volume: 48, anno: 2000,
pagine: 239 - 247
SICI:
0043-1745(200003/04)48:2<239:BOSIIE>2.0.ZU;2-K
Fonte:
ISI
Lingua:
ENG
Soggetto:
ADSORPTION; FLUMETSULAM; MOBILITY; PH;
Keywords:
sulfentrazone; titration; sorption; herbicide ionization; pKa; pesticide leaching; retention factor; mobility;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
21
Recensione:
Indirizzi per estratti:
Indirizzo: Grey, TL Univ Georgia, Dept Crop & Soil Sci, Coll Agr & Environm Sci, Georgia Expt Stn, 1109 Expt St, Griffin, GA 30223 USA Univ Georgia 1109 Expt StGriffin GA USA 30223 ffin, GA 30223 USA
Citazione:
T.L. Grey et al., "Behavior of sulfentrazone in ionic exchange resins, electrophoresis gels, and cation-saturated soils", WEED SCI, 48(2), 2000, pp. 239-247

Abstract

Sulfentrazone persistence in soil requires many crop rotational restrictions. The sorption and mobility of sulfentrazone play an important role in its soil persistence. Thus, a series of laboratory experiments were conductedto mimic the soil properties of cation and anion exchange with different intermediates. The molecular characterization and ionization shift of sulfentrazone from a neutral molecule to an anion were determined using a three-dimensional graphing technique and titration curve, respectively Sorption and mobility of 2.6 X 10(-5) M C-14-sulfentrazone were evaluated using a soilsolution technique with ion exchange resins and polyacrylamide gel electrophoresis, respectively. Solution pH ranged from 4.0 to 7.4. As pH increased, sulfentrazone sorption to an anion resin increased and its sorption to a cation resin decreased. Percent sulfentrazone in solution was pH-dependent and ranged between 0 to 18% and 54 to 88% for the anion and cation resins, respectively. Mobility of sulfentrazone on a 20% polyacryalmide gel resulted in Rf values of +0.02 and +0.39 for pH of 4.0 and 7.4, respectively. A double peak for sulfentrazone was detected in the polyacrylamide gel when thepH (6.0 and 6.8) was near the reported pKa of 6.56. There was no clear interaction for the sorption of sulfentrazone at 1.0 mg kg(-1) to Congaree loamy sand or Decatur silty clay loam saturated with either calcium or potassium. Sulfentrazone behavior with the polyacrylamide electrophoresis gels andion resins indicate the potential for this herbicide to occur as a polar or Zwitter ion. Sulfentrazone was adsorbed by potassium, calcium, and sodiumsaturated resins and subsequently desorbed using variable pH solutions. The level of sulfentrazone adsorption will vary among soil types and the amount of desorption into solution may be soil cation-dependent.

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Documento generato il 04/08/20 alle ore 19:34:25